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United States Patent | 6,208,683 |
Mizuguchi ,   et al. | March 27, 2001 |
In a direct sequence/code division multiple access (DS/CDMA) type interference canceller receiving apparatus having a delaying unit for delaying a reception signal into zeroth through (N-1)-th delayed signals, zeroth through (N-1)-th path receivers for demodulating the zeroth thorough the (N-1)-th delayed signals into zeroth through (N-1)-th demodulated signals, and a combining unit for combining the zeroth through the (N-1)-th demodulated signals into a combined signal, an n-th path receivers includes an n-th follow-up path detection unit for detecting an n-th follow-up path for the n-th path receiver on the basis of a peculiar spread code in response to an n-th coefficient control signal. The n-th follow-up path detection unit produces n-th follow-up path information indicative of the n-th follow-up path. A follow-up path control unit controls path reception timings for the zeroth through the (N-1)-th path receivers on the basis of searched path information supplied from a multi-path searcher and zeroth through the (N-1)-th follow-up path information. The follow-up path control unit supplies the delaying unit with a path reception timing signal indicative of first through (N-1)-th delay amounts for first through (N-1)-th delay circuits in the delaying unit.
Inventors: | Mizuguchi; Hironori (Tokyo, JP); Yoshida; Shousei (Tokyo, JP); Ushirokawa; Akihisa (Tokyo, JP) |
Assignee: | NEC Corporation (Tokyo, JP) |
Appl. No.: | 095102 |
Filed: | June 10, 1998 |
Jun 10, 1997[JP] | 9-152154 |
Current U.S. Class: | 375/140; 375/148; 455/137 |
Intern'l Class: | H04L 27//30 |
Field of Search: | 375/130,148,142,143,144,150,152,343,347 370/335,342,441,479 455/132,137,133,296,63,67.3,31.1 |
5550811 | Aug., 1996 | Kaku et al. | 370/342. |
5687162 | Nov., 1997 | Yoshida et al. | 370/203. |
5740208 | Apr., 1998 | Hulbert et al. | 375/346. |
5940432 | Aug., 1999 | Saito et al. | 375/206. |
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7-30514 | Jan., 1995 | JP. | |
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Mitsuo Yokoyama, Spread Spectrum Communication Systems, Kagaku Gijutsu Shuppan Sha, publishers, 1988, pp. 290-311. |